it and its offspring: [This prohibition] applies to the female [i.e., the mother] animal, namely, that it is prohibited to slaughter a mother animal and its male or female offspring [on the same day]. The prohibition does not apply, however, to males [i.e., to the father animals], and it is permissible to slaughter the father animal along with its male or female offspring [on the same day]. — [Chul. 78b]

you shall slaughter it so that it should be acceptable for you: From the very beginning of your slaughtering, take care that it should be “acceptable for you.” And what makes it acceptable?"

לרצנכם תזבחו: תחלת זביחתכם הזהרו שתהא לרצון לכם. ומהו הרצון:

It shall be eaten on that day: [Now, although it has already been stated that thanksgiving-offerings must be eaten on the day of sacrificing (Lev. 7:15), the Torah repeats this here] exclusively to warn us that the slaughtering must be performed on this condition. Do not slaughter it with the intention of eating it on the next day, for if you have this invalidating intention in mind, the sacrifice will not be “acceptable for you” (Torath Kohanim 22:135) [Indeed, it will be rejected (פִּגּוּל; see Rashi Lev. 7:18)]. Another explanation of לִרְצֹנְכֶם is: “knowingly.” From here, [we learn that] if someone slaughtered an animal in an incidental manner [i.e., according to Rashi , without intending to slaughter, just to pick up the knife or to throw it. According to Tosafoth, if he did not intend to slaughter, but only to sever the organs, or if he thought that it was an ordinary animal, and did not realize that it was to be slaughtered as a holy sacrifice], then [even though the animal is fit to be eaten as ordinary non-consecrated meat, nevertheless,] regarding being slaughtered as a holy sacrifice, it is deemed unfit. — [Chul. 13a] Now, although Scripture has already stated [that a sacrifice is “not acceptable” if, while slaughtering, one intended to eat it after its permissible time] in the case of sacrifices that may be eaten for two days (see Lev. 7:18), it specifies it again regarding those sacrifices that must be eaten on the same day (see Rashi Lev. 7:15), namely, that they [too] must be slaughtered with the intention of eating them within their permissible time.

It shall be eaten on that day: [As explained above (see preceding Rashi)], Scripture states this here only to warn us that the slaughtering must be performed with this intention. For if it meant to fix the time limit for eating it, this has already been stated, “And the flesh of his thanksgiving peace-offering [shall be eaten on the day that it is offered…]” (Lev. 7:15). - [Torath Kohanim 7:113]

You shall not desecrate [My Holy Name]: By transgressing My commandments intentionally. Now, is it not already implied by the verse “ You shall not desecrate [My Holy Name,” that if you do not transgress, God’s Name will be sanctified? So] what do we learn by Scripture adding “I shall be sanctified [amidst the children of Israel]?” [It teaches us:] Surrender your life [and do not transgress God’s commandments], and [thus] sanctify My Name. Now, one might think [that this commandment applies even] in private [i.e., if he is not in the presence of ten or more Jews]. Scripture, therefore, says here “[I shall be sanctified] amidst the children of Israel” [i.e., one is obliged to sacrifice one’s life to avoid transgressing God’s commandments only in the presence of ten or more Jews]. And when one sacrifices oneself, one shall do so with the willingness to die, anyone who [submits to] sacrifices himself while assuming [that God will surely perform] a miracle [for him and save his life], for this person, God does not perform a miracle, for so we find in [the case of] Hananiah, Mishael and Azariah, that [when the evil Nebuchadnezzar threatened to throw them into a fiery furnace], they did not submit themselves on the condition [that God would perform] a miracle, as Scripture says, “[Behold, there is our God Whom we worship; He can save us from the burning, fiery furnace and from your hands, O king!] But if not, let it be known to you, O king [that we will not worship your god, neither will we prostrate ourselves to the golden image that you have set up]!” (Dan. 3:17-18). [We see here that whatever the outcome,] whether [God would] rescue [them] or not- [they declared, regardless] “Let it be known to you, O king [that we will not prostrate ourselves…]!” - [Torath Kohanim 22:137]

Who took you out [of the land of Egypt]: on this very condition [i.e., to be willing to sacrifice your lives in sanctification of My Holy Name. — [Torath Kohanim 22:138] [And do not think that since it is an obligation, you will not receive reward for sacrificing yourselves, for]